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CHAPTER 4 PORT FUNCTIONS
User’s Manual U15798EJ2V0UD
Figure 4-6. Block Diagram of P21, P24, P27
PU: Pull-up resistor option register
PM: Port mode register
RD: Port 2 read signal
WR: Port 2 write signal
RD
Internal bus
P21/SO3,
P24/SO1,
P27/TxD0
P-ch
WR
PU
WR
PORT
WR
PM
PU21, PU24, PU27
Output latch
(P21, P24, P27)
PM21, PM24, PM27
Selector
V
DD0
Alternate
function
Содержание mPD780344 Series
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